The image on the left (click to expand) from June of 2002 shows Porta Farm in Zimbabwe, a settlement of 6,000 to 10,000 people. The image on the right is the same area today. Does it help to explain if I say that the residents were opponents of Mugabe’s regime?
The images are from the American Association for the Advancement of Science. Kottke has further links. Note, once again, that David Brin was correct.